Question 1

What is the normal polarity of a myocardial cell during the resting period, which causes the electrical potential in for the cell?
A)Positively charged
B)Negatively charged
C)Outside the cell membrane is negatively charged, inside is positively charged
D)Inside the cell membrane is negatively charged, outside is positively charged

Accepted Answer

The normal polarity of a myocardial cell during the resting period, which causes the electrical potential in the cell, is for the outside of the cell membrane to be negatively charged, and the inside to be positively charged. This has brought about the term "polarized cell" for a normal resting myocardial cell.

Question 2

In what part of the heart do cardiac impulses originate?
A)SA node
B)AV node
C)Bundle of His
D)Left atrium

Accepted Answer

Cardiac impulses originate in the SA node. From here, they spread to the atria and cause depolarization, showing up on the EKG as a P wave.

Question 3

What is the measurement provided by the PR interval on an EKG?
A)The time needed for the impulse to spread through the ventricles and pass through the SA node
B)The time needed for the impulse to spread through the atria and pass through the SA node
C)The time needed for the impulse to spread through the ventricles and pass through the AV junction
D)The time needed for the impulse to spread through the atria and pass through the AV junction

Accepted Answer

The PR interval on an EKG measures the time needed for the impulse to spread through the atria and pass through the AV junction. The normal time for this to occur is .12-.20 seconds. Longer intervals can indicate blockage.

Question 4

What is specifically recorded by LEAD III on a 12-lead EKG?
A)The difference in electrical potential between the left leg and left arm electrodes
B)The difference in electrical potential between the left leg and right arm electrodes
C)The difference in electrical potential between the left arm and right arm electrodes
D)The electrical potential at one site relative to zero potential

Accepted Answer

Lead III on a 12-lead EKG measures the difference in electrical potential between the left leg and left arm electrodes.

Question 5

What is the Mason Likar modification?
A)An adjustment made during metabolic formula used to account for errors due to obesity
B)An alteration to the formula determining gross oxygen consumption for clients with asthma
C)A different arrangement for placing electrodes in a 12-lead EKG
D)A way to add resistance to certain exercises without physically increasing the weight of the dumbbell or apparatus

Accepted Answer

The Mason Likar modification is a different arrangement for placing electrodes in a 12-lead EKG. This is sometimes necessary due to electrode movement, muscular activity, or respiration.

Question 6

What electrolyte abnormality causes an ST depression with prominent U waves and flattened T waves?
A)Hyperkalemia
B)Hypokalemia
C)Hypocalcemia
D)Hypercalcemia

Accepted Answer

Hypokalemia causes an ST depression with prominent U waves and flattened T waves.

Question 7

Which of the following is used to assess coronary artery calcium?
A)Electron beam computed tomography
B)Radionuclide ventriculography
C)Single photon emission computed tomography
D)Radionuclide scintigraphy

Accepted Answer

Electron beam computed tomography is used to assess coronary artery calcium. Additionally, spiral tomography can be used.

Question 8

What is the procedure that uses a balloon to flatten plaque against the wall of an artery to create a more patent space within the artery for improved blood flow?
A)Percutaneous Transluminal Coronary Angioplasty (PTCA)
B)Atherectomy
C)Laser Angioplasty
D)Coronary Artery Bypass Graft Surgery (CABGS)

Accepted Answer

Percutaneous Transluminal Coronary Angioplasty (PTCA) uses a balloon to flatten plaque against the wall of an artery to create a more patent space within the artery for improved blood flow. The atherectomy uses a rotating shaver and the laser angioplasty uses pulses of photons to eliminate the plaque. A bypass completely rebuilds parts of the artery which are beyond help using other less-invasive methods.

Question 9

What is the test function of Holter EKG monitoring?
A)Monitors blood glucose level throughout the day
B)Radioactive dye is injected to show abnormalities in the EKG
C)Measures the vasodilation of the major vessels of the heart and shows them on the EKG
D)Tracks abnormalities on EKG as they occur throughout the day

Accepted Answer

Holter EKG monitoring tracks abnormalities on the EKG as they occur throughout the day. The client records the activities performed during this 24 hour testing period and the results are reviewed with the activities to see which elicit abnormal responses.

Question 10

What is measured on an EKG by the horizontal squares?
A)Q wave
B)R wave
C)Duration
D)Voltage

Accepted Answer

The horizontal squares on an EKG measure duration. This is based on cardiac electrical potentials that travel at the rate of 25mm/second.

Question 11

Which characteristic below accurately describes a T wave?
A)Frequently hard to detect in a normal EKG
B)Suggests ischemia if inverted
C)Prominent peaks may indicate myocardial infarction or hyperkalemia
D)Is normally perfectly symmetrical

Accepted Answer

Prominent peaks in a T wave may indicate myocardial infarction or hyperkalemia. These waves, representing ventricular depolarization, are normally not symmetrical.

Question 12

Which leads on the EKG view the electrical activity of the heart on the horizontal plane?
A)Leads I through III
B)Bipolar leads
C)Augmented unipolar leads
D)Unipolar precordial leads

Accepted Answer

The unipolar precordial leads view the electrical activity of the heart on the horizontal plane. These leads are placed in 6 positions on the chest.

Question 13

What is the condition called when the SA node fails to depolarize the atria?
A)Sinus pause
B)Cardiac failure
C)Atrial flutter
D)Hypersensitization

Accepted Answer

When the SA node fails to depolarize the atria, it is called sinus pause, or sinus arrest. If not corrected by another part of the heart, such as the AV node, this could lead to cardiac arrest.

Question 14

What is a Wenckebach AV block?
A)A delay in the conduction of the impulse through the AV junction
B)Increasingly difficult AV node conduction showing a P wave not followed by a QRS complex on EKG
C)A delayed AV conduction at the bundle braches
D)No conduction of impulse from the atria to the ventricles

Accepted Answer

A Wenckebach AV block, also called a Mobitz I block, is when increasingly difficult AV node conduction shows a P wave not followed by a QRS complex on EKG. This is considered a second-degree AV block.

Question 15

Which atrioventricular block does not impair cardiac function?
A)Hemiblock
B)First-degree block
C)Mobitz I block
D)Right bundle branch block

Accepted Answer

A first-degree block does not impair cardiac function. It can be caused by hyperkalemia, quinidine, digitalis, and ischemic heart disease.

Question 16

What are some causes of a third-degree AV block?
A)Certain drugs, such as quinidine and atropine
B)Age, digitalis intoxication, or myocardial infarction
C)Heart disease and damage from uncontrolled diabetes mellitus
D)Hypertension, coronary artery disease, and cardiomyopathy

Accepted Answer

Some causes of a third-degree AV block are age, digitalis intoxication, and myocardial infarction. This is also called a complete heart block because no impulses are being transmitted from the atria to the ventricles.

Question 17

In particular, which type of atrioventricular block patient would be a good candidate for the implantation of a pacemaker?
A)Hemiblocks
B)Transmural ischemic blocks
C)Posterior fascicular block
D)Third-degree block

Accepted Answer

In particular, a patient with a third-degree atrioventricular block would be a good candidate for the implantation of a pacemaker. This would accommodate for the failure of the AV node to disseminate the necessary impulse from the atria to the ventricles.

Question 18

What condition may be indicated very early by an EKG with ST elevations, or tall, upright T waves?
A)Sudden cardiac death
B)Myocardial ischemia
C)Transmural myocardial infarction
D)Coronary artery disease

Accepted Answer

Transmural myocardial infarction may be indicated very early by an EKG with ST elevations, or tall, upright T waves. To make a better determination, the V1 and V2 leads may be viewed to determine if ventricular hypertrophy is evident.

Question 19

Which electrolyte abnormality will show shortened ventricular repolarization and shortened QT intervals on EKG?
A)Hypercalcemia
B)Hypocalcemia
C)Hyperkalemia
D)Hypokalemia

Accepted Answer

The electrolyte abnormality hypercalcemia will show shortened ventricular repolarization and shortened QT intervals on EKG.

Question 20

What does the horizontal aspect of the EKG measure?
A)Voltage
B)Duration
C)Watts
D)Waveforms

Accepted Answer

The horizontal aspect of the EKG measures duration. The smaller squares are .04 seconds in duration and the larger ones are .20 seconds in duration.

Quiz 1: Free CSC

What is the normal polarity of a myocardial cell during the resting period, which causes the electrical potential in for the cell?

In what part of the heart do cardiac impulses originate?

What is the measurement provided by the PR interval on an EKG?

What is specifically recorded by LEAD III on a 12-lead EKG?

What is the Mason Likar modification?

What electrolyte abnormality causes an ST depression with prominent U waves and flattened T waves?

Which of the following is used to assess coronary artery calcium?

What is the procedure that uses a balloon to flatten plaque against the wall of an artery to create a more patent space within the artery for improved blood flow?

What is the test function of Holter EKG monitoring?

What is measured on an EKG by the horizontal squares?

Which characteristic below accurately describes a T wave?

Which leads on the EKG view the electrical activity of the heart on the horizontal plane?

What is the condition called when the SA node fails to depolarize the atria?

What is a Wenckebach AV block?

Which atrioventricular block does not impair cardiac function?

What are some causes of a third-degree AV block?

In particular, which type of atrioventricular block patient would be a good candidate for the implantation of a pacemaker?

What condition may be indicated very early by an EKG with ST elevations, or tall, upright T waves?

Which electrolyte abnormality will show shortened ventricular repolarization and shortened QT intervals on EKG?

What does the horizontal aspect of the EKG measure?